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Update test_runner/performance/test_unlogged.py

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Co-authored-by: Heikki Linnakangas <heikki@neon.tech>
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Konstantin Knizhnik
2025-07-29 08:04:11 +03:00
committed by Konstantin Knizhnik
co-authored by Heikki Linnakangas
parent b7dbf4cf56
commit 2546b79428
1 changed files with 1 additions and 1 deletions
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test_runner/performance/test_unlogged.py
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@@ -11,7 +11,7 @@ if TYPE_CHECKING:
#
# This test demonstrates effect of relpersistence cache. Postgres doesn't store relation persistence in shared buffer tag.
# It means that if page is evicted from shared buffers and relation is not cache in relation cache, then persistence=0 (auto) is used.
# It means that if page is evicted from shared buffers and relation is not in the backend's relation cache, then persistence=0 (auto) is used.
# For vanilla Postgres it is not important, because in both cases we need to write changes to the file.
# In Neon, neon_write does nothing nothing for a permanent relation, while for an unlogged relation, it writes the page to the local file.
# Originally Neon always called `mdexists` to check if the local file exists and determine if it's an unlogged relation. Now we check the cache first.